Mixed breed dogs share genetic characteristics with two or more different breeds. For most of these dogs their genetic background is unknown and they often tend to be called by many different names. Just a few these names include random bred dog, mongrel, and bitzer.
Even though a mixed breed dogs have several advantages over purebreds, most people still seem to prefer purebreds. However, one of the advantages of mixed breed dogs is that they tend to show a higher intelligence on average than most purebreds.
Also, it has been shown that these dogs on average are healthier and live much longer than purebred dogs. This is due to something called hybrid vigor which happens when you mix two or more breeds together. Purebred dogs often carry genetic problems with them and these are often passed on to the next generation.